A numerical simulation and mophodynamic analysis on the evolution of the Zhujiang River Delta in China:6000～2500 a BP

WU Chao-yu; BAO Yun; REN Jie; LEI Ya-ping; SHI He-yin; HE Zhi-gang

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Article Navigation > Haiyang Xuebao > 2006 > 28(4): 64-80

WU Chao-yu, BAO Yun, REN Jie, LEI Ya-ping, SHI He-yin, HE Zhi-gang. A numerical simulation and mophodynamic analysis on the evolution of the Zhujiang River Delta in China:6000～2500 a BP[J]. Haiyang Xuebao, 2006, 28(4): 64-80.

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A numerical simulation and mophodynamic analysis on the evolution of the Zhujiang River Delta in China:6000～2500 a BP

1.
Center for Coastal Ocean Research, Zhongshan University, Guangzhou 510275, China
2.
Center for Coastal Ocean Research, Zhongshan University, Guangzhou 510275, China;Department of Mechanics, Zhongshan University, Guangzhou 510275, China

Received Date: 2005-07-01
Rev Recd Date: 2005-12-10

Abstract

Abstract

The Zhujiang River Delta is one of the most complicated large-scale estuarine systems in China.It consists of a reticulated network system and several estuary bays.A long-term morphdynamic model (PRD-LTMM) is developed to simulate the evolution of the Zhujiang River Delta and its estuarine system.Long-term simulation method and concept of model verification are discussed.The underwater topography of the estuarine bay in the last transgr ession maximum about 6 000 a BP is reconstructed and serves as an initial condition of this model.The driving forces and control factors considered in the long-term delta evolution model include presentative tides, river discharge, and sediment supply from the Zhujiang River system, sea-level variation, sediment compaction and neotectonic movement.Deposition rates and total deposition volume are investigated and determined and then used to calibrate the model.More than 34 bore hole data with ¹⁴C dating are carefully analyzed to verify the model-simulated deposition.The local archaeological evidence is compared with the model out put as circumst antial verification.New findings of the Holocene delta evolution indicate that the chronological and spatial progress of the delta is different from previous studies in many aspects.More details are provided to the delta and network development originated from the effects of the morphodynamic sturctures "gate" and associated bi-directional jets.The model confirms that the mor phological constraint, e.g., the rocky islands in the shallowest uarine baysis one of the most important control factors affecting the long-term delta evolution of the Zhujiang River Delta.
- morphdynamic model,
- long-term,
- evolution,
- Zhujiang River Delta,

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References(49)

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